Fisher FIELDVUEDVC6200f Instruction Manual page 249

Instruction Manual
D103412X012
Figure E‐10. Flow control with pressure override
Flow
PID
OUT
IN
Pressure
PID
IN
FT
PT
NOTE:
IN THIS EXAMPLE, BOTH THE FLOW AND PRESSURE PID BLOCKS CONTROL A SUPPLY VALVE. THE FLOW PID OPERATES IN A
PRESSURE REGIME BELOW A SAFETY LIMIT. SINCE THIS IS A LOW PRESSURE FOR THE PRESSURE PID, IT SENDS A HIGH
OUTPUT SIGNAL TO THE SUPPLY VALVE, TELLING IT TO OPEN MORE TO INCREASE THE PRESSURE.
Block Errors
Table E‐8 lists conditions reported in the BLOCK_ERR [6] parameter.
Table E‐8. CSEL BLOCK_ERR Conditions
Condition Number
1 Block Configuration Error—SHED_OPT or BYPASS set to 0
7 Input failure/process variable has Bad status—The parameter linked to IN is indicating a Bad status.
15 Out of Service—The actual mode is Out of Service (OOS).
CTLSL
SEL_1 OUT
OUT
SEL_2
Supply
Valve
Condition Name and Description
DVC6200f Digital Valve Controller
CSEL Function Block
February 2017
249